.scrolltop-wrap {
    position: fixed;
    right: 15px;
    bottom: 25px;
    width: 45px;
    height: 45px;
    cursor: pointer;
    display: none;
    background: url("../../static/arrow-up.png") no-repeat center;
    .hover-tip {
        position: absolute;
        background-color: #494949;
        color: #fff;
        text-align: center;
        font-size: 12px;
        line-height: 23px;
        width: 80px;
        left: -73px;
        top: 13px;
        border-radius: 6px;
        display: none;
    }
    .tip-box {
        position: absolute;
        top: 0px;
        right: -8px;
        font-size: 32px;
        color: #494949;
    }
    &:hover .hover-tip{
        display: block;
    }
}